Software Bugs Rattle U.S. Air Force F-35 Block 4 Progress

57th Aircraft Maintenance Sqdn.
Members of the 57th Aircraft Maintenance Sqdn., an operational unit, marshaled into a parking position a 53rd Wing F-35A dedicated to flight testing.
Credit: Lawrence Crespo/U.S. Air Force
A software bug that effectively would have disabled the Northrop Grumman APG-81 radar on every U.S.-operated Lockheed Martin F-35A came uncomfortably close to being released to the Air Force fleet early last year. “We went all the way to the end of test until we realized the radar does not work,”...

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